CN108051702B - Fault line parameter calculation method based on single-phase earth fault recording data - Google Patents

Fault line parameter calculation method based on single-phase earth fault recording data Download PDF

Info

Publication number
CN108051702B
CN108051702B CN201711224470.6A CN201711224470A CN108051702B CN 108051702 B CN108051702 B CN 108051702B CN 201711224470 A CN201711224470 A CN 201711224470A CN 108051702 B CN108051702 B CN 108051702B
Authority
CN
China
Prior art keywords
current
fault
voltage
line
zero
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711224470.6A
Other languages
Chinese (zh)
Other versions
CN108051702A (en
Inventor
梁振锋
张晓阳
张惠智
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Shoufeng Smart Power Research Institute Co.,Ltd.
Original Assignee
Xian University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Technology filed Critical Xian University of Technology
Priority to CN201711224470.6A priority Critical patent/CN108051702B/en
Publication of CN108051702A publication Critical patent/CN108051702A/en
Application granted granted Critical
Publication of CN108051702B publication Critical patent/CN108051702B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a fault line parameter calculation method based on single-phase earth fault recording data, which is implemented according to the following steps: step 1, acquiring fault data, wherein a single-phase earth fault occurs on a line MN, and current and voltage sampling values on two sides of a power transmission line are acquired through a fault recording device or a relay protection device; step 2, filtering the collected current and voltage sampling values by adopting a low-pass filter with the cut-off frequency of 100Hz, and filtering high-frequency components; step 3, calculating the current and voltage of the non-fault phase-to-phase line mode at two sides of the line; step 4, calculating zero-mode current and zero-mode voltage at two sides of the circuit; and 5, calculating the fault line parameters, and solving the problem of solving the fault line parameters.

Description

Fault line parameter calculation method based on single-phase earth fault recording data
Technical Field
The invention belongs to the technical field of power system parameter calculation, and particularly relates to a fault line parameter calculation method based on single-phase earth fault recording data.
Background
The transmission line parameters are basic data of short-circuit current calculation, relay protection setting, transient stability calculation, load flow calculation, fault distance measurement and the like of the power system. If the parameter error of the power transmission line is large, many problems are caused.
1) The short-circuit current has a large calculation error, and the electrical equipment selected by using the result is not economical or is easily damaged under the short-circuit impact.
2) The relay protection setting value error is large, so that the protection overtaking action or refusing action is caused.
3) The power system stability calculation conclusion is inaccurate, and system instability can be caused.
4) The power system has large load flow calculation error and influences system planning, economic operation, network loss analysis and the like.
5) For the ranging method depending on the line parameters, the fault ranging error is increased.
At present, transmission line parameters are generally measured by using measuring equipment before commissioning. However, the parameters of the transmission line are influenced by factors such as geological, temperature, wind speed and earth resistivity along the line after the transmission line is put into operation, and the parameters can change. The online measurement of the transmission line parameters is widely researched for reflecting the accurate parameters of the transmission line under different operating conditions.
With the increasing popularity of the WAMS, there is a possibility to use PMU measurement data for line parameter identification. Chinese patent "a method for identifying power transmission line parameters" (application No. CN201210575136.6), "chinese patent" a method for identifying power transmission line parameters based on PMU data "(application No. CN201610839532.3) and" chinese patent "an on-line identification system and method for identifying power transmission line parameters" (application No. CN201710169327.5) all use voltage and current phasor values as known quantities to identify power transmission line parameters in the frequency domain, but the frequency domain method produces errors when extracting power frequency components, resulting in increased errors in identification results.
The fault recording data comprises rich transient state information, the fault recording data is used as a known quantity in a time domain, a differential equation describing a power transmission line model is written by utilizing a circuit law based on a power transmission line equivalent circuit model, and a least square algorithm is adopted to obtain a fault line parameter.
Disclosure of Invention
The invention aims to provide a fault line parameter calculation method based on single-phase earth fault recording data, which solves the problem of obtaining fault line parameters.
The technical scheme adopted by the invention is that the fault line parameter calculation method based on single-phase earth fault recording data is implemented according to the following steps:
step 1, acquiring fault data;
step 2, low-pass filtering;
step 3, calculating the current and voltage of the non-fault phase-to-phase line mode at two sides of the line;
step 4, calculating zero-mode current and zero-mode voltage at two sides of the circuit;
and 5, calculating the parameters of the fault line.
The present invention is also characterized in that,
the step 1 specifically comprises the following steps: when a single-phase earth fault occurs to a line MN, current and voltage sampling values at two sides of a power transmission line are obtained through a fault wave recording device or a relay protection device, wherein the sampling values comprise M-side A, B, C-phase electricityFlow rate ima、imb、imcVoltage quantity uma、umb、umcMagnitude of current i of A, B, C phases on N sidena、inb、incVoltage quantity una、unb、unc。
The step 2 specifically comprises the following steps:
and filtering the collected current and voltage sampling values by adopting a low-pass filter with the cut-off frequency of 100Hz, and filtering out high-frequency components.
The step 3 specifically comprises the following steps:
the non-fault phase-to-phase line mode current and voltage are obtained by the following formulas (1) to (4):
Figure BDA0001487003050000031
Figure BDA0001487003050000032
Figure BDA0001487003050000033
Figure BDA0001487003050000034
in the formula (I), the compound is shown in the specification,
Figure BDA0001487003050000035
is the voltage of the interphase line mode at the M side and the current of the interphase line mode,
Figure BDA0001487003050000036
the voltage and current of the interphase line mode at the N side are shown;
Figure BDA0001487003050000037
the voltage and current of the non-fault phase on the M side,
Figure BDA0001487003050000038
the voltage and the current of the N-side non-fault phase.
The step 4 specifically comprises the following steps:
the zero-mode current and voltage on two sides of the line are obtained by the following equations (5) - (8):
Figure BDA0001487003050000039
Figure BDA00014870030500000310
Figure BDA00014870030500000311
Figure BDA00014870030500000312
in the formula um0、im0Is a zero-mode voltage and a zero-mode current on the M side, un0、in0The voltage and current are zero mode voltage and zero mode current of the N side; u. ofma、umb、umc、ima、imb、imcVoltage and current of M side A, B, C phase, una、unb、unc、ina、inb、incVoltage and current of the N-side A, B, C phase.
The step 5 specifically comprises the following steps:
step (5.1), calculating a positive sequence parameter:
step (5.1.1), establishing a non-fault interphase line model pi-shaped equivalent circuit;
step (5.1.2), writing a differential equation of the equivalent circuit according to the circuit law as formula (9):
Figure BDA0001487003050000041
obtained by the formula (9):
Figure BDA0001487003050000042
Figure BDA0001487003050000043
in the formula (I), the compound is shown in the specification,
Figure BDA0001487003050000044
is the voltage and current of the M side non-fault phase-to-phase line mode,
Figure BDA0001487003050000045
the voltage and the current of the N-side non-fault phase-to-phase line mode;
Figure BDA0001487003050000046
is the first differential of the line mode voltage and the line mode current of the non-fault phase at the M side to the time t,
Figure BDA0001487003050000047
is the first differential of the N-side non-faulty phase-to-phase line mode voltage over time t,
Figure BDA0001487003050000048
second order differential of M side non-fault phase-to-phase line mode voltage to time t; r1、L1、C1Positive sequence resistance, positive sequence inductance and positive sequence capacitance are to be solved;
step (5.1.3), substituting the non-fault interphase line mode current and voltage obtained in step (3) into equations (10) and (11), wherein the first order and second order differential are calculated by numerical difference, and the equation (10) is solved by adopting a least square algorithm to obtain the line positive sequence capacitor C1(ii) a C to be obtained1Substituting an expression (11), solving the expression (11) by adopting a least square algorithm to obtain a positive sequence resistance and a positive sequence inductance;
step 5.2, calculation of zero sequence parameters
Step 5.2.1, determining a fault position through a distance measuring device or manual inspection, and determining that the proportion of the length of the fault position from the M side bus to the total length of the line is alpha;
step 5.2.2, establishing a zero-mode R-L equivalent circuit of the fault line according to the fault position;
step 5.2.3, writing a differential equation of the equivalent circuit according to the circuit law as formula (12):
Figure BDA0001487003050000051
from (12), it can be obtained:
Figure BDA0001487003050000052
in the formula, alpha is the percentage of the distance from a fault point to a bus at the M end in the total length of the line; u. ofm0、im0Is zero mode voltage, current, u of M siden0、in0Is the zero mode voltage and current of the N side;
Figure BDA0001487003050000053
is the first differential of the zero mode current of the M side and the N side to the time t; r0、L0Zero-sequence resistance and zero-sequence inductance to be solved;
and 5.2.4, substituting the zero-mode current and zero-mode voltage on two sides of the line obtained in the step 4 into a formula (13), calculating the first-order differential by using numerical difference, and solving the formula (13) by adopting a least square algorithm to obtain the zero-sequence resistance and zero-sequence inductance of the line.
The method for calculating the fault line parameters based on the single-phase earth fault recording data has the advantages that firstly, voltage and current data obtained by sampling after a fault are filtered, then an equivalent circuit model of the fault line is established, differential equations describing the circuit relation of all electrical quantities are written, the parameters of the fault line are calculated by adopting a least square method, the single-phase earth fault recording data is used for calculation, the phasor does not need to be extracted, errors caused by calculation of the voltage phasor and the current phasor are avoided, and the method is not influenced by frequency. The method can effectively calculate the positive sequence parameter and the zero sequence parameter of the fault line, and the error of the parameters is within 5 percent.
Drawings
FIG. 1 is a flow chart of a fault line parameter calculation method based on single-phase earth fault recording data according to the present invention;
FIG. 2 is a diagram of a power transmission line model in the fault line parameter calculation method based on single-phase earth fault recording data according to the present invention;
FIG. 3 is a line non-fault inter-phase line model pi-type equivalent circuit in the fault line parameter calculation method based on single-phase earth fault recording data of the present invention;
fig. 4 is a zero-mode equivalent circuit model of the fault line in the fault line parameter calculation method based on single-phase earth fault recording data.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a fault line parameter calculation method based on single-phase earth fault recording data, a flow chart is shown in figure 1, a power transmission line model is shown in figure 2, and the method is implemented according to the following steps:
step 1, acquiring fault data, specifically: when a single-phase earth fault occurs to a line MN, current and voltage sampling values at two sides of a power transmission line are obtained through a fault wave recording device or a relay protection device, wherein the current values i comprise current amounts i of A, B, C phases at an M sidema、imb、imcVoltage quantity uma、umb、umcMagnitude of current i of A, B, C phases on N sidena、inb、incVoltage quantity una、unb、unc；
Step 2, low-pass filtering, specifically:
filtering the collected current and voltage sampling values by adopting a low-pass filter with the cut-off frequency of 100Hz, and filtering out high-frequency components;
step 3, calculating the current and the voltage of the non-fault phase-to-phase line mode at two sides of the line, and specifically comprising the following steps:
the non-fault phase-to-phase line mode current and voltage are obtained by the following formulas (1) to (4):
Figure BDA0001487003050000071
Figure BDA0001487003050000072
Figure BDA0001487003050000073
Figure BDA0001487003050000074
in the formula (I), the compound is shown in the specification,
Figure BDA0001487003050000075
is the voltage of the interphase line mode at the M side and the current of the interphase line mode,
Figure BDA0001487003050000076
the voltage and current of the interphase line mode at the N side are shown;
Figure BDA0001487003050000077
the voltage and current of the non-fault phase on the M side,
Figure BDA0001487003050000078
voltage and current of the N-side non-fault phase;
step 4, calculating zero-mode current and zero-mode voltage at two sides of the circuit, specifically:
the zero-mode current and voltage on two sides of the line are obtained by the following equations (5) - (8):
Figure BDA0001487003050000079
Figure BDA00014870030500000710
Figure BDA00014870030500000711
Figure BDA00014870030500000712
in the formula um0、im0Is a zero-mode voltage and a zero-mode current on the M side, un0、in0The voltage and current are zero mode voltage and zero mode current of the N side; u. ofma、umb、umc、ima、imb、imcVoltage and current of M side A, B, C phase, una、unb、unc、ina、inb、incVoltage and current for the N-side A, B, C phase;
step 5, calculating fault line parameters, specifically:
step (5.1), calculating a positive sequence parameter:
step (5.1.1), as shown in fig. 3, establishing a non-fault interphase line model pi-type equivalent circuit;
step (5.1.2), writing a differential equation of the equivalent circuit according to the circuit law as formula (9):
Figure BDA0001487003050000081
obtained by the formula (9):
Figure BDA0001487003050000082
Figure BDA0001487003050000083
in the formula (I), the compound is shown in the specification,
Figure BDA0001487003050000084
is the voltage and current of the M side non-fault phase-to-phase line mode,
Figure BDA0001487003050000085
the voltage and the current of the N-side non-fault phase-to-phase line mode;
Figure BDA0001487003050000086
is the first differential of the line mode voltage and the line mode current of the non-fault phase at the M side to the time t,
Figure BDA0001487003050000087
is the first differential of the N-side non-faulty phase-to-phase line mode voltage over time t,
Figure BDA0001487003050000088
second order differential of M side non-fault phase-to-phase line mode voltage to time t; r1、L1、C1Positive sequence resistance, positive sequence inductance and positive sequence capacitance are to be solved;
step (5.1.3), substituting the non-fault interphase line mode current and voltage obtained in step (3) into equations (10) and (11), wherein the first order and second order differential are calculated by numerical difference, and the equation (10) is solved by adopting a least square algorithm to obtain the line positive sequence capacitor C1(ii) a C to be obtained1Substituting an expression (11), solving the expression (11) by adopting a least square algorithm to obtain a positive sequence resistance and a positive sequence inductance;
step 5.2, calculation of zero sequence parameters
Step 5.2.1, determining a fault position through a distance measuring device or manual inspection, and determining that the proportion of the length of the fault position from the M side bus to the total length of the line is alpha;
step 5.2.2, as shown in FIG. 4, establishing a zero-modulus R-L equivalent circuit of the fault line according to the fault position;
step 5.2.3, writing a differential equation of the equivalent circuit according to the circuit law as formula (12):
Figure BDA0001487003050000091
from (12), it can be obtained:
Figure BDA0001487003050000092
in the formula, alpha is the percentage of the distance from a fault point to a bus at the M end in the total length of the line; u. ofm0、im0Is zero mode voltage, current, u of M siden0、in0Is the zero mode voltage and current of the N side;
Figure BDA0001487003050000093
is the first differential of the zero mode current of the M side and the N side to the time t; r0、L0Zero-sequence resistance and zero-sequence inductance to be solved;
and 5.2.4, substituting the zero-mode current and zero-mode voltage on two sides of the line obtained in the step 4 into a formula (13), calculating the first-order differential by using numerical difference, and solving the formula (13) by adopting a least square algorithm to obtain the zero-sequence resistance and zero-sequence inductance of the line.
Examples
If the power transmission line has A-phase grounding fault, calculating BC phase-to-phase line mode voltage and current u by using voltage and current sampling values at two sides of the linembc、unbc、imbc、inbc(ii) a Establishing a BC interphase line model pi-shaped equivalent circuit; writing a differential equation of the BC interphase line mode equivalent circuit according to a circuit law; will umbc、unbc、imbc、inbcSubstituting the differential equation; and solving by adopting a least square algorithm to obtain a line positive sequence resistance, a positive sequence inductance and a positive sequence capacitance. Determining the fault position through a distance measuring device or manual inspection; establishing a zero-mode R-L equivalent circuit of a fault line according to the fault position; writing a differential equation of a zero-mode R-L equivalent circuit according to a circuit law sequence; will um0、un0、im0、in0Substituting the differential equation, and solving by adopting a least square algorithm to obtain the zero-sequence resistance and zero-sequence inductance of the line.
And (3) simulating a certain 110kV power transmission system by using ATP/EMTP. The specific parameters are as follows: total length of transmission line is 30km, unit transmission line parameter r1＝0.105Ω/km，L1＝1.258mH/km，C1＝0.0092μF/km，r0＝0.315Ω/km，L0＝3.774mH/km，C00.0031. mu.F/km. Zero sequence inductance L of M-side systemm011.6mH, positive sequence inductance Lm130.8 mH; n-side system zero sequence inductor Lm023.1mH, positive sequence inductance Lm1＝61.6mH；Em＝1.05∠0°，En1.00-30 degrees. The sampling frequency was chosen to be 4 kHz.
The results of the calculations obtained using the method of the present invention are shown in table 1. As can be seen from Table 1, the error of the calculation results of the positive sequence resistance, the positive sequence inductance and the positive sequence capacitance is small. Wherein R is1Error not exceeding 5%, L1Error of (3) is not more than 0.2%, C1The error of (2) is only 0.01%. As can be seen from table 1, although the calculation results of the zero-sequence resistance and the zero-sequence inductance are affected by the transition resistance and the fault location, the calculation error is small. Wherein R is0Error not exceeding 3%, L0The error does not exceed 0.5%. Therefore, the method provided by the invention has higher calculation precision.
Table 1 electric transmission line parameter calculation results
Figure BDA0001487003050000111

Claims (1)

1. The fault line parameter calculation method based on the single-phase earth fault recording data is characterized by comprising the following steps:
step 1, acquiring fault data, specifically: when a single-phase earth fault occurs to a line MN, current and voltage sampling values at two sides of a power transmission line are obtained through a fault wave recording device or a relay protection device, wherein the current values i comprise current amounts i of A, B, C phases at an M sidema、imb、imcVoltage quantity uma、umb、umcMagnitude of current i of A, B, C phases on N sidena、inb、incVoltage quantity una、unb、unc；
Step 2, low-pass filtering, specifically:
filtering the collected current and voltage sampling values by adopting a low-pass filter with the cut-off frequency of 100Hz, and filtering out high-frequency components;
step 3, calculating the current and the voltage of the non-fault phase-to-phase line mode at two sides of the line, and specifically comprising the following steps:
the non-fault phase-to-phase line mode current and voltage are obtained by the following formulas (1) to (4):
Figure FDA0002397384780000011
Figure FDA0002397384780000012
Figure FDA0002397384780000013
Figure FDA0002397384780000014
in the formula (I), the compound is shown in the specification,
Figure FDA0002397384780000015
is the voltage of the interphase line mode at the M side and the current of the interphase line mode,
Figure FDA0002397384780000016
the voltage and current of the interphase line mode at the N side are shown;
Figure FDA0002397384780000017
the voltage and current of the non-fault phase on the M side,
Figure FDA0002397384780000018
voltage and current of the N-side non-fault phase;
step 4, calculating zero-mode current and zero-mode voltage at two sides of the circuit, specifically:
the zero-mode current and voltage on two sides of the line are obtained by the following equations (5) - (8):
Figure FDA0002397384780000021
Figure FDA0002397384780000022
Figure FDA0002397384780000023
Figure FDA0002397384780000024
in the formula um0、im0Is a zero-mode voltage and a zero-mode current on the M side, un0、in0The voltage and current are zero mode voltage and zero mode current of the N side; u. ofma、umb、umc、ima、imb、imcVoltage and current of M side A, B, C phase, una、unb、unc、ina、inb、incVoltage and current for the N-side A, B, C phase;
step 5, calculating fault line parameters, specifically:
step (5.1), calculating a positive sequence parameter:
step (5.1.1), establishing a non-fault interphase line model pi-shaped equivalent circuit;
step (5.1.2), writing a differential equation of the equivalent circuit according to the circuit law as formula (9):
Figure FDA0002397384780000025
obtained by the formula (9):
Figure FDA0002397384780000026
Figure FDA0002397384780000031
in the formula (I), the compound is shown in the specification,
Figure FDA0002397384780000032
is the voltage and current of the M side non-fault phase-to-phase line mode,
Figure FDA0002397384780000033
the voltage and the current of the N-side non-fault phase-to-phase line mode;
Figure FDA0002397384780000034
is the first differential of the line mode voltage and the line mode current of the non-fault phase at the M side to the time t,
Figure FDA0002397384780000035
is the first differential of the N-side non-faulty phase-to-phase line mode voltage over time t,
Figure FDA0002397384780000036
second order differential of M side non-fault phase-to-phase line mode voltage to time t; r1、L1、C1Positive sequence resistance, positive sequence inductance and positive sequence capacitance are to be solved;
step (5.1.3), substituting the non-fault interphase line mode current and voltage obtained in step (3) into equations (10) and (11), wherein the first order and second order differential are calculated by numerical difference, and the equation (10) is solved by adopting a least square algorithm to obtain the line positive sequence capacitor C1(ii) a C to be obtained1Formula (11) is substituted, and positive sequence resistance and positive sequence inductance are obtained by solving formula (11) through a least square algorithm:
step 5.2, calculation of zero sequence parameters
Step 5.2.1, determining a fault position through a distance measuring device or manual inspection, and determining that the proportion of the length of the fault position from the M side bus to the total length of the line is alpha;
step 5.2.2, establishing a zero-mode R-L equivalent circuit of the fault line according to the fault position;
step 5.2.3, writing a differential equation of the equivalent circuit according to the circuit law as formula (12):
Figure FDA0002397384780000037
from (12), it can be obtained:
Figure FDA0002397384780000038
in the formula, alpha is the percentage of the distance from a fault point to a bus at the M end in the total length of the line; u. ofm0、im0Is zero mode voltage, current, u of M siden0、in0Is the zero mode voltage and current of the N side;
Figure FDA0002397384780000041
is the first differential of the zero mode current of the M side and the N side to the time t; r0、L0Zero-sequence resistance and zero-sequence inductance to be solved;
and 5.2.4, substituting the zero-mode current and zero-mode voltage on two sides of the line obtained in the step 4 into a formula (13), calculating the first-order differential by using numerical difference, and solving the formula (13) by adopting a least square algorithm to obtain the zero-sequence resistance and zero-sequence inductance of the line.
CN201711224470.6A 2017-11-29 2017-11-29 Fault line parameter calculation method based on single-phase earth fault recording data Active CN108051702B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711224470.6A CN108051702B (en) 2017-11-29 2017-11-29 Fault line parameter calculation method based on single-phase earth fault recording data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711224470.6A CN108051702B (en) 2017-11-29 2017-11-29 Fault line parameter calculation method based on single-phase earth fault recording data

Publications (2)

Publication Number Publication Date
CN108051702A CN108051702A (en) 2018-05-18
CN108051702B true CN108051702B (en) 2021-01-15

Family

ID=62121064

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711224470.6A Active CN108051702B (en) 2017-11-29 2017-11-29 Fault line parameter calculation method based on single-phase earth fault recording data

Country Status (1)

Country Link
CN (1) CN108051702B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109901014A (en) * 2019-03-08 2019-06-18 西安交通大学 The voltage waveform acquisition method and its monitoring system of power grid ground fault
CN110398630B (en) * 2019-07-25 2021-06-25 福建睿思特科技股份有限公司 Dynamic tracking method for frequency of power system
CN110601153B (en) * 2019-08-19 2020-12-25 西安交通大学 Relay protection method for single-end quantity of direct-current power distribution network
CN110850288A (en) * 2019-11-12 2020-02-28 河南国网宝泉抽水蓄能有限公司 Fault recording fixed value setting method for pumped storage unit
CN113848389B (en) * 2021-09-23 2023-06-13 中国南方电网有限责任公司超高压输电公司广州局 Zero sequence impedance estimation method and device for cross-coupled transmission line

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101299538A (en) * 2008-04-08 2008-11-05 昆明理工大学 Cable-aerial mixed line fault travelling wave ranging method
ES2403783A2 (en) * 2011-03-24 2013-05-21 Universidad Politécnica de Madrid Method and system of discrimination of land faults in circuits with transitions aerial line-cable (Machine-translation by Google Translate, not legally binding)
CN103630798A (en) * 2013-09-12 2014-03-12 清华大学 Transmission line single-phase grounding fault single-end ranging method
CN106501675A (en) * 2016-11-01 2017-03-15 清华大学 The instantaneous singlephase earth fault method of single end distance measurement of wind farm grid-connected transmission line of electricity

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6879917B2 (en) * 2002-06-14 2005-04-12 Progress Energy Carolinas Inc. Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities
CN101581752B (en) * 2009-06-09 2011-06-22 深圳市双合电气股份有限公司 Power transmission line parameter online measurement method based on fault wave recording
CN102621388A (en) * 2012-04-13 2012-08-01 山东电力集团公司潍坊供电公司 Electric transmission line lumped parameter on-line determination method based on synchronous time domain signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101299538A (en) * 2008-04-08 2008-11-05 昆明理工大学 Cable-aerial mixed line fault travelling wave ranging method
ES2403783A2 (en) * 2011-03-24 2013-05-21 Universidad Politécnica de Madrid Method and system of discrimination of land faults in circuits with transitions aerial line-cable (Machine-translation by Google Translate, not legally binding)
CN103630798A (en) * 2013-09-12 2014-03-12 清华大学 Transmission line single-phase grounding fault single-end ranging method
CN106501675A (en) * 2016-11-01 2017-03-15 清华大学 The instantaneous singlephase earth fault method of single end distance measurement of wind farm grid-connected transmission line of electricity

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
基于参数辨识的消弧线圈接地电网单相接地故障测距方法;贾清泉 等;《电工技术学报》;20161230;第31卷(第23期);第77-85页 *
输电线路零序参数的在线自适应IGG抗差辨识方法;薛安成 等;《电网技术》;20161230;第40卷(第12期);第3923-3929页 *

Also Published As

Publication number Publication date
CN108051702A (en) 2018-05-18

Similar Documents

Publication Publication Date Title
CN108051702B (en) Fault line parameter calculation method based on single-phase earth fault recording data
CN105425109B (en) A kind of small current grounding system single-phase grounding selecting method that can improve accuracy rate
CN105785229B (en) The Fault Identification method of isolated neutral system
CN111983510B (en) Single-phase ground fault phase selection method and system based on phase voltage and current abrupt change
CN105372616B (en) A kind of CVT states Online Transaction Processing and online evaluation method
CN101252273A (en) String complement capacitance transmission line distance protecting method based on model recognition
CN103941149B (en) Electrified railway traction networks localization of fault method
CN102967779B (en) Identifying method of distribution parameters of transmission line
CN108957225B (en) Direct-current distribution line single-end fault location method considering cable distribution capacitance
CN110954743B (en) Distributed wave recording device and low-current grounding line selection method
CN111426908B (en) Single-phase earth fault protection method, device and system for small current earthing system
CN105182187B (en) Distribution feeder phase-to phase fault distance-finding method based on mapping function
CN109188174B (en) Method for judging AC line outlet fault
CN104237677B (en) 220kV and above power network list back transmission line Zero sequence parameter on-line identification method
CN111551822B (en) Power distribution network single-phase earth fault phase selection method and device
CN103427405B (en) The differential guard method of transmission line of electricity based on Higher Order Cumulants
CN113687188A (en) Fault line selection method and device based on two-stage zero-sequence power change
CN110082596B (en) Distance protection fault impedance calculation method and system based on high-frequency transient quantity
CN110146780B (en) Ferromagnetic resonance distinguishing method for neutral point ungrounded flexible power distribution network system
CN109444666B (en) Power distribution network single-phase high-blocking line fault identification method and device
CN109001589B (en) Line parameter time domain calculation method based on non-full-phase operation fault recording data
CN105242135B (en) Three-phase power transformer on-line parameter identification device and its realize algorithm
CN102082420B (en) Longitudinal differential protection method of power transmission line
CN111900695B (en) Single-phase earth fault removing method and device
CN106443352B (en) A kind of method of neutral point ungrounded electric network single-phase earth fault line selection

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20211210

Address after: 211113 No. 69, Feitian Avenue, Airport Economic Development Zone, Jiangning District, Nanjing City, Jiangsu Province

Patentee after: Nanjing Shoufeng Smart Power Research Institute Co.,Ltd.

Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an

Patentee before: XI'AN University OF TECHNOLOGY

TR01 Transfer of patent right